Beryllium copper alloy explosion-proof material, preparation method thereof and application of beryllium copper alloy explosion-proof material to electric tool

Abstract

The invention relates to a beryllium-copper alloy explosion-proof material, a preparation method thereof and application of the beryllium-copper alloy explosion-proof material to an electric tool, and the beryllium-copper alloy explosion-proof material comprises the following components in percentage by mass: 1.95-2.35% of beryllium, 0.6-0.9% of cobalt, 0.2-0.5% of nickel, 0.25-0.5% of chromium, 0.1-0.25% of silver, 0.5-1.0% of titanium, 0.05-0.15% of iron, 0.05-0.15% of aluminum, 0.05-0.15% of silicon, 0.05-0.13% of rare earth lanthanum, 0.03-0.05% of rare earth cerium and the balance of copper. The balance is copper and inevitable trace impurities; a beryllium copper alloy explosion-proof material is subjected to cold forging and pressing, forging and pressing forming, trimming and shaping, and finally high-precision grinding and heat treatment are carried out, so that the explosion-proof electric wrench accessory including a main shaft square tenon, a sleeve type movable plug and a connecting part thereof is manufactured. The raw material ratio of the beryllium-copper alloy is changed, meanwhile, precious rare metal elements, rare earth lanthanum and rare earth cerium are added, the performance parameters are improved through quick lime reduction and cold forging, and then the alloy performance is improved again through two times of heat treatment, so that the main performance parameters of the anti-explosion electric wrench product are improved by 3%-5%.

Description

Technical Field

[0001] The invention relates to the field of copper alloy materials, and in particular to a beryllium copper alloy explosion-proof material, a preparation method thereof, and application in electric tools. Background Art

[0002] In modern industrial and military production, the application of high-performance alloy materials plays a vital role in improving equipment performance, enhancing safety and extending service life. Beryllium copper, as a supersaturated solid solution copper-based alloy, has been widely used in many fields due to its unique mechanical properties, physical properties, chemical properties and excellent corrosion resistance.

[0003] After solution treatment and aging treatment, beryllium copper alloy shows high strength limit, elastic limit, yield limit and fatigue limit comparable to special steel. These characteristics make beryllium copper perform well when subjected to high load and complex stress environment. At the same time, beryllium copper also has high electrical conductivity, thermal conductivity, high hardness and wear resistance, as well as high creep resistance and corrosion resistance. These comprehensive properties give it a significant advantage in manufacturing high-precision and high-reliability mechanical parts.

[0004] Beryllium copper alloys are particularly used in the manufacture of various mold inserts, safety explosion-proof components, and the replacement of steel materials for high-precision, complex-shaped molds. For example, in tools and equipment such as explosion-proof electric wrenches, explosion-proof impact drills, welding electrode materials, die-casting machines, and injection molding machine punches, the high strength and wear resistance of beryllium copper ensure the durability and precision of the tools, while the high electrical and thermal conductivity contribute to the heat dissipation and stable operation of the equipment.

[0005] With the advancement of science and technology and the development of industry, the performance requirements for tools such as explosion-proof electric wrenches are increasing. In order to solve this problem, the existing patent CN115011841B discloses a casting method for titanium-copper alloy explosion-proof materials, which relates to the field of casting technology. The alloy explosion-proof material contains the following components in percentage by mass: 45-50% titanium, 25-30% copper, 10-15% zinc, 5-10% nickel, 0.05% beryllium, 0.01% indium, 0.3% niobium, and 0.01% silicon. The casting method of the titanium-copper alloy explosion-proof material is based on vacuum consumable electrode arc melting technology, including preparation period, arc striking period, melting period, arc stopping and pouring period, and casting cooling steps. This patented technology mainly solves the problems of casting defects, insufficient purity, poor explosion-proof performance, etc. in existing explosion-proof alloys. Although it can meet certain usage requirements and conforms to the explosion-proof performance test method of beryllium copper alloy tools, in some explosion-proof accessories, such as the fast-rotating spindle square tenon and sleeve-type plug of explosion-proof electric wrenches and other key components, such components need to be frequently used in high-intensity and high-frequency environments, and have higher requirements for usage intensity. Therefore, it is still necessary to improve the performance and technical parameters of such components. Summary of the invention

[0006] In order to overcome the above problems existing in the prior art, the purpose of the present invention is to provide a beryllium copper alloy explosion-proof material and a preparation method thereof and application in electric tools, so as to improve the performance technical parameters of the material by 3%-5%.

[0007] The specific technical solutions provided by the present invention are as follows:

[0008] A beryllium copper alloy explosion-proof material comprises the following components in percentage by mass: 1.95-2.35% beryllium, 0.6-0.9% cobalt, 0.2-0.5% nickel, 0.25-0.5% chromium, 0.1-0.25% silver, 0.5-1.0% titanium, 0.05-0.15% iron, 0.05-0.15% aluminum, 0.05-0.15% silicon, 0.05-0.13% rare earth lanthanum, 0.03-0.05% rare earth cerium, and the balance is copper and inevitable trace impurities.

[0009] The present invention also provides a method for preparing a beryllium copper alloy explosion-proof material, comprising the following preparation steps:

[0010] S1. Prepare raw materials according to the composition ratio of the copper alloy material, divide the raw copper into two parts with a mass ratio of 60%:40%, put the raw beryllium and 60% of the raw copper into a heated electric furnace crucible, then put nickel, aluminum, silicon and silver into the electric furnace crucible, and then heat it to form a beryllium copper alloy liquid, which is cast into the mold cavity to obtain a six-mother alloy copper material;

[0011] S2, preheat the remaining 40% of the raw copper to 100-200°C, then put it into a heated electric furnace crucible, then put chromium, titanium, cobalt and iron into the crucible, then heat it up to form a chromium-copper alloy liquid, and cast it into the mold cavity to obtain a five-mother alloy copper material;

[0012] S3, the six-mother alloy copper material and the five-mother alloy copper material are placed in a heated electric furnace crucible, and then heated to 900°C, and then rare earth lanthanum and rare earth cerium are added, and the temperature is continued to be heated to 1400°C to form a copper alloy liquid, and after 5 minutes, it is cast into the preheated model cavity, and taken out after 30-40 minutes to obtain a copper alloy blank;

[0013] S4. Put the copper alloy material blank into an electric roasting furnace, heat it to 650-750°C, take it out, and then put it into quicklime, leave it for 72 hours, and take it out to obtain the beryllium copper alloy explosion-proof material.

[0014] Preferably, in step S1, the raw copper is electrolytic copper with a purity of 99.99%, and the raw beryllium is beryllium master alloy, which is Cu-25wt%Be alloy.

[0015] Preferably, in step S1, the temperature is raised to 1450° C. to form a beryllium copper alloy liquid, and then a slag remover is added to perform slag removal and degassing for 5 minutes, and then the beryllium copper alloy liquid is poured into a preheated end spoon or ladle, and the slag is removed again, and finally cast into a steel mold, taken out after 35-40 minutes, and the six-mother alloy copper material is obtained by cleaning the sand, eliminating the water riser, and then shot blasting.

[0016] Preferably, in step S2, the temperature is raised to 1750°C to form a chromium-copper alloy liquid, and then a slag remover is added to perform slag removal and degassing for 5 minutes, and then the beryllium-copper alloy liquid is poured into a preheated end spoon or ladle, and the slag is removed again, and finally cast into a steel mold, taken out after 35-40 minutes, and the five-mother alloy copper material is obtained by cleaning the sand, eliminating the water riser, and then shot blasting.

[0017] Preferably, in step S3, after the copper alloy liquid is heated to 1400° C., surface slag removal and degassing are first performed, and then casting is performed.

[0018] The invention also provides an application of the beryllium copper alloy explosion-proof material in electric tools, and uses the beryllium copper alloy explosion-proof material to manufacture explosion-proof electric wrench accessories.

[0019] Preferably, the explosion-proof electric wrench accessories include a spindle square tenon, a sleeve-type movable plug and connecting parts thereof, and the preparation process thereof includes cold forging and forging the beryllium copper alloy explosion-proof material, trimming and shaping it, and finally high-precision grinding and heat treatment.

[0020] Preferably, the heat treatment includes solution heat treatment and aging heat treatment;

[0021] The solution heat treatment includes: heating the explosion-proof electric wrench accessories to 760-800°C, keeping the temperature constant for 3.5-4.5 hours, and then air cooling;

[0022] The aging heat treatment includes: heating the explosion-proof electric wrench accessories after the solution heat treatment to 360-400°C, keeping the temperature constant for 3.5-6.5h, and then air cooling.

[0023] Preferably, the prepared explosion-proof electric wrench accessories have a spindle square tenon and a sleeve-type movable hardness of HRC46-50, an elongation δ≤1.0%, and a tensile strength of 1226-1445N / mm 2 , elastic limit is 900-946N / mm 2 , electrical conductivity IACS is 23%, thermal conductivity is 160 (W / (m·K)), density is 8.65g / cm 3 , magnetic property ≤0-5nT.

[0024] The beryllium copper alloy explosion-proof material of the present invention, its preparation method and application in electric tools have the following advantages:

[0025] 1. The present invention changes the raw material ratio of beryllium copper alloy, adds precious rare metal elements, rare earth lanthanum and rare earth cerium, and improves performance parameters through quicklime reduction and cold forging. Finally, the alloy performance is further improved through two heat treatments, so that the main performance parameters of the explosion-proof electric wrench product are improved by 3%-5%, showing higher strength, hardness, elasticity, wear resistance, fatigue limit and heat resistance.

[0026] 2. The beryllium copper alloy explosion-proof material and explosion-proof electric wrench accessories not only have excellent mechanical properties, but also have high electrical conductivity, thermal conductivity and impact resistance, and are non-magnetic. In certain applications, the material will not produce sparks when impacted. This feature makes it extremely safe in flammable and explosive environments. DETAILED DESCRIPTION

[0027] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the preferred embodiments.

[0028] Example 1

[0029] The present embodiment provides a beryllium copper alloy explosion-proof material, which contains the following components in percentage by mass: 2.1% beryllium, 0.8% cobalt, 0.4% nickel, 0.4% chromium, 0.2% silver, 0.8% titanium, 0.1% iron, 0.1% aluminum, 0.1% silicon, 0.08% rare earth lanthanum, 0.04% rare earth cerium, and the remainder is copper and inevitable trace impurities.

[0030] According to the preset metal and non-metallic element contents of the copper alloy explosion-proof material, each alloy raw material is weighed so that the content of each element in the final copper alloy explosion-proof material blank reaches the above value. The copper is 99.99% electrolytic copper raw material, which is cut into small cubes of 100*100mm, the beryllium is Cu-25%Be beryllium master alloy, the cobalt is electrolytic cobalt, the nickel is electrolytic nickel, the chromium is electrolytic chromium, the titanium is sponge titanium, the iron is pure iron, the aluminum is electrolytic aluminum, and the silicon is silicon particles.

[0031] The preparation method of the beryllium copper alloy explosion-proof material in Example 1 comprises the following steps:

[0032] S1. According to the composition ratio of the copper alloy material, after calculation, the raw materials are prepared, the beryllium master alloy and 60% of the total electrolytic copper are placed in a heated electric furnace crucible, and then nickel, aluminum, silicon and silver are placed in the gap between the beryllium master alloy and the electrolytic copper in the electric furnace crucible, and then the temperature is raised and heated to 1450°C. At this time, the copper liquid has formed a cloud-like flower, and the six non-ferrous metals quickly adjust to form a fusion body at high temperature, and naturally form a beryllium copper alloy liquid of six elements, and then add a slag remover to remove slag and gas. After 5 minutes, when the beryllium master alloy liquid is free of slag, gas and clean, the beryllium copper alloy liquid is poured back into a preheated end spoon or lifting bag, slag is removed again, and finally cast into a steel mold of about 2 kg, and taken out after 40 minutes, and the six master alloy copper materials are obtained by sand cleaning, eliminating water risers, and shot blasting;

[0033] S2, placing the crucible in a vacuum induction melting furnace for preheating, and then putting the remaining 40% of the electrolytic copper blocks preheated to 150°C, and then putting chromium, titanium, cobalt and iron into the gap between the electrolytic copper blocks in the crucible, and then heating, heating to 1750°C, at this time the copper water has formed cloud-like flowers, and the five non-ferrous metals quickly adjust to form a fusion body at high temperature, naturally forming five elements of chromium-copper alloy liquid, and then put in a slag remover to remove slag and gas, after 5 minutes, when the chromium-copper alloy liquid is free of slag, gas and clean, pour the chromium-copper alloy liquid into the preheated end spoon or lifting bag, slag again, and finally cast into a steel mold of about 2 kg, take it out after 40 minutes, remove sand, eliminate water risers, and then shot blast to obtain five mother alloy copper materials;

[0034] S3, the six-mother alloy copper material and the five-mother alloy copper material are placed in a preheated crucible, and then heated to 900°C, and then rare earth lanthanum and rare earth cerium are added, and the temperature is continued to be raised to 1400°C, and the surface slag is removed and degassed. After 5 minutes, it is cast into the preheated model cavity, taken out after 30-40 minutes, and the copper alloy blank is obtained by sand cleaning, eliminating water risers, and then shot blasting;

[0035] S4. Put the copper alloy material blank into an electric roasting furnace, heat it up to 650-750°C, take it out, transfer it to a steel box, store 100mm of quicklime in the steel box, and then cover it with 150mm of quicklime. Leave it for 72 hours, and take it out to obtain the beryllium copper alloy explosion-proof material.

[0036] Example 2

[0037] The present embodiment provides a beryllium copper alloy explosion-proof material, which contains the following components in percentage by mass: 1.95% beryllium, 0.9% cobalt, 0.2% nickel, 0.5% chromium, 0.1% silver, 1.0% titanium, 0.05% iron, 0.15% aluminum, 0.05% silicon, 0.05% rare earth lanthanum, 0.03% rare earth cerium, and the remainder is copper and inevitable trace impurities.

[0038] According to the preset contents of metal and non-metal elements in the copper alloy explosion-proof material, each alloy raw material is weighed so that the content of each element in the final copper alloy explosion-proof material blank reaches the above values.

[0039] The preparation method of the beryllium copper alloy explosion-proof material in Example 2 comprises the following steps:

[0040] S1. According to the composition ratio of the copper alloy material, after calculation, the raw materials are prepared, the beryllium master alloy and 60% of the total electrolytic copper are placed in a heated electric furnace crucible, and then nickel, aluminum, silicon and silver are placed in the gap between the beryllium master alloy and the electrolytic copper in the electric furnace crucible, and then the temperature is raised and heated to 1450°C. At this time, the copper liquid has formed a cloud-like flower, and the six non-ferrous metals quickly adjust to form a fusion body at high temperature, and naturally form a beryllium copper alloy liquid of six elements, and then add a slag remover to remove slag and gas. After 5 minutes, when the beryllium master alloy liquid is free of slag, gas and clean, the beryllium copper alloy liquid is poured back into a preheated end spoon or lifting bag, slag is removed again, and finally cast into a steel mold of about 2 kg, and taken out after 40 minutes, and the six master alloy copper materials are obtained by sand cleaning, eliminating water risers, and shot blasting;

[0041] S2, placing the crucible in a vacuum induction melting furnace for preheating, and then putting the remaining 40% of the electrolytic copper blocks preheated to 200°C, and then putting chromium, titanium, cobalt and iron into the gap between the electrolytic copper blocks in the crucible, and then heating, heating to 1750°C, at this time the copper water has formed cloud-like flowers, and the five non-ferrous metals quickly adjust to form a fusion body at high temperature, naturally forming five elements of chromium-copper alloy liquid, and then put in a slag remover to remove slag and gas. After 5 minutes, when the chromium-copper alloy liquid is free of slag, gas and clean, pour the chromium-copper alloy liquid into the preheated end spoon or lifting bag, slag again, and finally cast into a steel mold of about 2 kg, take it out after 40 minutes, remove sand, eliminate water risers, and then shot blast to obtain a five-element copper material;

[0042] S3, the six-mother alloy copper material and the five-mother alloy copper material are placed in a preheated crucible, and then heated to 900°C, and then rare earth lanthanum and rare earth cerium are added, and the temperature is continued to be raised to 1400°C, and the surface slag is removed and degassed. After 5 minutes, it is cast into the preheated model cavity, taken out after 30-40 minutes, and the copper alloy blank is obtained by sand cleaning, eliminating water risers, and then shot blasting;

[0043] S4. Put the copper alloy material blank into an electric roasting furnace, heat it up to 650-750°C, take it out, transfer it to a steel box, store 100mm of quicklime in the steel box, and then cover it with 150mm of quicklime. Leave it for 72 hours, and take it out to obtain the beryllium copper alloy explosion-proof material.

[0044] Example 3

[0045] The present embodiment provides a beryllium copper alloy explosion-proof material, which contains the following components in percentage by mass: 2.35% beryllium, 0.6% cobalt, 0.5% nickel, 0.25% chromium, 0.25% silver, 0.5% titanium, 0.15% iron, 0.05% aluminum, 0.15% silicon, 0.13% rare earth lanthanum, 0.05% rare earth cerium, and the remainder is copper and inevitable trace impurities.

[0046] According to the preset contents of metal and non-metal elements in the copper alloy explosion-proof material, each alloy raw material is weighed so that the content of each element in the final copper alloy explosion-proof material blank reaches the above values.

[0047] The preparation method of the beryllium copper alloy explosion-proof material in Example 3 comprises the following steps:

[0048] S1. According to the composition ratio of the copper alloy material, after calculation, the raw materials are prepared, the beryllium master alloy and 60% of the total electrolytic copper are placed in a heated electric furnace crucible, and then nickel, aluminum, silicon and silver are placed in the gap between the beryllium master alloy and the electrolytic copper in the electric furnace crucible, and then the temperature is raised and heated to 1450°C. At this time, the copper liquid has formed a cloud-like flower, and the six non-ferrous metals quickly adjust to form a fusion body at high temperature, and naturally form a beryllium copper alloy liquid of six elements, and then add a slag remover to remove slag and gas. After 5 minutes, when the beryllium master alloy liquid is free of slag, gas and clean, the beryllium copper alloy liquid is poured back into a preheated end spoon or lifting bag, slag is removed again, and finally cast into a steel mold of about 2 kg, and taken out after 40 minutes, and the six master alloy copper materials are obtained by sand cleaning, eliminating water risers, and shot blasting;

[0049] S2, placing the crucible in a vacuum induction melting furnace for preheating, and then putting the remaining 40% of the electrolytic copper blocks preheated to 120°C, and then putting chromium, titanium, cobalt and iron into the gap between the electrolytic copper blocks in the crucible, and then heating, heating to 1750°C, at this time the copper water has formed cloud-like flowers, and the five non-ferrous metals quickly adjust to form a fusion body at high temperature, naturally forming five elements of chromium-copper alloy liquid, and then put in a slag remover to remove slag and gas, after 5 minutes, when the chromium-copper alloy liquid is free of slag, gas and clean, pour the chromium-copper alloy liquid into the preheated end spoon or lifting bag, slag again, and finally cast into a steel mold of about 2 kg, take it out after 40 minutes, remove sand, eliminate water risers, and then shot blast to obtain five mother alloy copper materials;

[0050] S3, the six-mother alloy copper material and the five-mother alloy copper material are placed in a preheated crucible, and then heated to 900°C, and then rare earth lanthanum and rare earth cerium are added, and the temperature is continued to be raised to 1400°C, and the surface slag is removed and degassed. After 5 minutes, it is cast into the preheated model cavity, taken out after 30-40 minutes, and the copper alloy blank is obtained by sand cleaning, eliminating water risers, and then shot blasting;

[0051] S4. Put the copper alloy material blank into an electric roasting furnace, heat it up to 650-750°C, take it out, transfer it to a steel box, store 100mm of quicklime in the steel box, and then cover it with 150mm of quicklime. Leave it for 72 hours, and take it out to obtain the beryllium copper alloy explosion-proof material.

[0052] Application Example 1

[0053] This application example provides an application of beryllium copper alloy explosion-proof material in electric tools.

[0054] The beryllium copper alloy explosion-proof materials of Examples 1-3 are cold forged, and according to the electric wrench main shaft square tenon and sleeve-type movable plug, as well as other parts, 630 tons, 1000 tons, and 1600 tons precision forging machines and corresponding dies are selected for cold forging. The forged blanks have already reached a hard state, and then after trimming and shaping, qualified and standardized electric wrench main shaft square tenon and sleeve-type movable plug, as well as other accessories are basically formed.

[0055] Then put the electric wrench spindle square tenon and sleeve-type movable plug, as well as other accessories, into the grinding area for high-precision grinding to improve product accuracy; then enter the machining or automation area to form precise and qualified product accessories.

[0056] Then the product accessories are subjected to solution heat treatment, the explosion-proof electric wrench accessories are fastened in a special mold, and then enter the heat treatment steel basket, the temperature is controlled at 760-800℃, and the constant temperature is maintained for 3.5-4.5h before air cooling;

[0057] The explosion-proof electric wrench accessories that have undergone solution heat treatment are subjected to aging heat treatment again, with the temperature controlled at 360-400°C. After being kept at a constant temperature for 3.5-6.5 hours, they are air-cooled to obtain the electric wrench spindle square tenon and sleeve-type movable plug, as well as other accessories.

[0058] The beryllium copper alloy explosion-proof materials prepared in Examples 1-3 were respectively prepared into explosion-proof electric wrench accessories. The hardness of the main shaft square tenon and sleeve-type movable explosion-proof electric wrench accessories prepared by testing was HRC46-50, the elongation δ≤1.0%, and the tensile strength was 1226-1445N / mm 2 , elastic limit is 900-946N / mm 2 , the electrical conductivity IACS is 23%, the thermal conductivity is 160 (W / (m·K)), the density is 8.65g / cm3, and the magnetic properties are ≤0-5nT, as shown in Table 1.

[0059] Table 1 Product material technical parameters

[0060]

[0061] The electric wrench main shaft square tenon and sleeve type active plug, as well as other parts, have extremely high strength limit, yield limit and fatigue limit after solidification and aging treatment. It also has high thermal conductivity, high electrical conductivity, high hardness, wear resistance and high temperature stability, high creep resistance and corrosion resistance, good casting performance, non-magnetic, no sparks when impacted and other characteristics. It can be used in various parts that are resistant to fatigue, high sensitivity, high elasticity, high temperature resistance, high strength, high hardness, no sparks, no magnetism, and resistant to harsh environments, such as aerospace, petrochemical, natural gas, metallurgy and mining, plastic molds, automobiles and machinery manufacturing and other fields.

[0062] Comparative Example 1

[0063] In the prior art, the chemical composition of beryllium copper alloy materials includes, by mass percentage, Be 1.5-3.0%, Co 0.2-0.5%, Ni 0.3-0.6%, Fe 0.04-0.1%, Ag 0.1-0.3%, and the remainder is copper and unavoidable impurities.

[0064] The copper alloy material has a hardness of HRC44.1 and a tensile strength of 11185N / mm 2 , elastic limit is 870N / mm 2 .

[0065] The present invention changes the raw material ratio of beryllium copper alloy, adds precious rare metal elements, rare earth lanthanum and rare earth cerium, improves performance parameters through quicklime reduction and cold forging, and finally improves the alloy performance again through two heat treatments, so that the main performance parameters of the explosion-proof electric wrench product are improved by 3%-5%, showing higher strength, hardness, elasticity, wear resistance, fatigue limit and heat resistance.

[0066] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A beryllium copper alloy explosion-proof material, characterized in that: The copper alloy explosion-proof material comprises the following components in percentage by mass: 1.95-2.35% beryllium, 0.6-0.9% cobalt, 0.2-0.5% nickel, 0.25-0.5% chromium, 0.1-0.25% silver, 0.5-1.0% titanium, 0.05-0.15% iron, 0.05-0.15% aluminum, 0.05-0.15% silicon, 0.05-0.13% rare earth lanthanum, 0.03-0.05% rare earth cerium, and the balance is copper and inevitable trace impurities.

2. A method for preparing the beryllium copper alloy explosion-proof material according to claim 1, characterized in that: The method comprises the following preparation steps: S1. Prepare raw materials according to the composition ratio of the copper alloy material, divide the raw copper into two parts with a mass ratio of 60%:40%, put the raw beryllium and 60% of the raw copper into a heated electric furnace crucible, then put nickel, aluminum, silicon and silver into the electric furnace crucible, and then heat it to form a beryllium copper alloy liquid, which is cast into the mold cavity to obtain a six-mother alloy copper material; S2, preheat the remaining 40% of the raw copper to 100-200°C, then put it into a heated electric furnace crucible, then put chromium, titanium, cobalt and iron into the crucible, then heat it up to form a chromium-copper alloy liquid, and cast it into the mold cavity to obtain a five-mother alloy copper material; S3, the six-mother alloy copper material and the five-mother alloy copper material are placed in a heated electric furnace crucible, and then heated to 900°C, and then rare earth lanthanum and rare earth cerium are added, and the temperature is continued to be heated to 1400°C to form a copper alloy liquid, and after 5 minutes, it is cast into the preheated model cavity, and taken out after 30-40 minutes to obtain a copper alloy blank; S4. Put the copper alloy material blank into an electric heating roasting furnace, heat it to 650-750°C, take it out, and then put it into quicklime and leave it for 72 hours to obtain beryllium copper alloy explosion-proof material.

3. The method for preparing a beryllium copper alloy explosion-proof material according to claim 2, characterized in that: In step S1, the raw copper is 99.99% pure electrolytic copper, and the raw beryllium is beryllium master alloy, which is Cu-25wt% Be alloy.

4. The method for preparing a beryllium copper alloy explosion-proof material according to claim 2, characterized in that: In step S1, the temperature is raised to 1450° C. to form a beryllium copper alloy liquid, and then a slag remover is added to perform slag removal and degassing for 5 minutes. The beryllium copper alloy liquid is then poured into a preheated end spoon or ladle, slag is removed again, and finally cast into a steel mold. After 35-40 minutes, it is taken out, sand is removed, water risers are eliminated, and then shot blasting is performed to obtain a six-mother alloy copper material.

5. The method for preparing a beryllium copper alloy explosion-proof material according to claim 2, characterized in that: In step S2, the temperature is raised to 1750°C to form a chromium-copper alloy liquid, and then a slag remover is added to perform slag removal and degassing for 5 minutes, and then the beryllium-copper alloy liquid is poured into a preheated end spoon or ladle, and the slag is removed again, and finally cast into a steel mold, and taken out after 35-40 minutes, and the five-mother alloy copper material is obtained by sand cleaning, eliminating water risers, and shot blasting.

6. The method for preparing a beryllium copper alloy explosion-proof material according to claim 2, characterized in that: In step S3, after the copper alloy liquid is heated to 1400°C, surface slag removal and degassing are first performed, and then casting is performed.

7. Application of the beryllium copper alloy explosion-proof material obtained according to any one of claims 1 to 6 in electric tools, characterized in that: Beryllium copper alloy explosion-proof materials are used to manufacture explosion-proof electric wrench accessories.

8. The use of the beryllium copper alloy explosion-proof material in electric tools according to claim 7, characterized in that: The explosion-proof electric wrench accessories include a main shaft square tenon, a sleeve-type movable plug and its connecting parts. The preparation process includes cold forging and forging of beryllium copper alloy explosion-proof materials, trimming and shaping, and finally high-precision grinding and heat treatment.

9. The use of the beryllium copper alloy explosion-proof material in electric tools according to claim 8, characterized in that: Heat treatment includes solution heat treatment and aging heat treatment; The solution heat treatment includes: heating the explosion-proof electric wrench accessories to 760-800°C, keeping the temperature constant for 3.5-4.5 hours, and then air cooling; The aging heat treatment includes: heating the explosion-proof electric wrench accessories after the solution heat treatment to 360-400°C, keeping the temperature constant for 3.5-6.5h, and then air cooling.

10. The use of the beryllium copper alloy explosion-proof material in electric tools according to claim 9, characterized in that: The hardness of the main shaft square tenon and sleeve type activity of the prepared explosion-proof electric wrench accessories is HRC46-50, the elongation δ≤1.0%, and the tensile strength is 1226-1445N / mm 2 , elastic limit is 900-946N / mm 2 , electrical conductivity IACS is 23%, thermal conductivity is 160 (W / (m·K)), density is 8.65g / cm 3 , magnetic property ≤0-5nT.

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